Calendar.



PATBNTED OCT. 10, 1905.

J. L. LANDRUM.

CALENDAR.

unmnmn mum HAY 25, 1905.

' UNITED STATES PATENT oEFioE.

CALENDAR.

Specification of Letters Patent.

Patented Oct. 10, 1.905.

Application filed May 25, 1905. Serial No. 262,213.

- River, in the county of Bell and State of Texas,

have invented new and useful Improvements in Calendars, of which the following is a speci- V fication.

My invention relates to calendars, and more particularly that kind known as perpetual calendars, and has forits object certain novel features of construction hereinafter described and claimed.

1n the accompanying drawings, Figurel is a plan view of the invention. Fig. 2 is a plan View of the two rotatable disks used in connection with the invention.

Referring specifically to the drawings, A denotes a piece of cardboard or other suitable material which forms the base of the calendar. At one corner of the base-board the centuries are arranged in four columns B, which are numbered atthe top 2, 4, 5, and 7, respectively. I

The twelve months of the year are arranged in seven columns C to the left of the columns B. At the top of the columns C is a sightopening D, through which numbers F on a rotatable disk G, pivoted, as at H, to the base board, are exposed. Said numbers extend from O to 6. The disk also contains an index E, which is exposed through a sight-opening 1 at the bottom of the columns C. Under said opening opposite the bottom of the col umn' containing the months September and December the number 2 is placed. February, March, and November are numbered 4. August is numbered 5, and January and October are numbered 7. These numbers 2, A, 5, and 7 correspond to the numbers at the top of the columns B.

The years of the century are arranged in seven columns, as at K, which columns are numbered at the top 0, 1, 2, 3, at, 5, and 6, respectively. The years are arranged in a sequence of four, as shown, one space being skipped at the end of each sequence.

The days of the month and week are indicated at L and M, respectively, being arranged in a table in the usual manner. At the top of the columns containing the days of the month is a sight-opening N, through which characters 0, indicating the days of the week, are exposed. The characters 0 are arranged on a rotatable disk P, pivoted at Q to the base-board.

At R are indicated guide-lines, by-which the characters 0 are registered with the characters L.

Directions: Let it be required to set the calendar for June, 1905. Find the century (1900) in the columns'B and note the number of the column in which it appears, which is 4. Next turn the disk G until the index E appears opposite thenumber 4 at the bottom of the columns G. Then note the number exposed through the sight-opening D, which is in line with the column containing the month of June, which is 5. Make a note of this number. Next find the year of the century in the columns K. This is 5 and appears in the column numbered 6. Note this number. Then add six to five, heretofore noted, and also add one, making a total of twelve. Find this number 12 in the columns L, and at the bottom of the column containing this number will be indicated the day of the week on which the month of June enters, which is Thursday. Now set the disk P so that Thursday indicated thereon will register with 1 in the columns L, which sets the calendar for the month of June. 1905. For leapyears one must be subtracted from the calculations for January and February. For instance, if the calendar is to be set for J anuary, 1904, instead of adding one, five, and one (obtained in the same manner as heretofore described) the one and five only are added, making a total of six. Look for this number on the columns L, as before, to find the day of the week on which. the month enters. In this case it is Friday. After this the disk P can be set as before.

Having thus described my invention, what is claimed as new, and desired to be secured by Letters Patent, is- I 1. A perpetual calendar, comprising a table of the centuries arranged in columns which have distinctive indexes, a table of the months arranged in columns having corresponding indexes, a disk provided with a series of numbers and movable to register the numbers with diiferent columns of months, a table of the years of a century arranged in seven col umns numbered the same as the disk, and a table of the days of the week and month arranged in columns and having a disk provided with the days of the week and movable to register with the respective columns.

- 2. A perpetual calendar comprising a table of centuries arranged in columns which have distinctive indexes, a table of months arranged IIO in columns having corresponding indexes, a provided with the days of the Week and movdisk provided With a series of numbers and able to register with the respective columns. movable according to said indexes to register In testimony whereof I have signed my name the numbers With difierent columns of months, to this specification in the presence of two subsequence of four and in seven columns one space being skipped after each fourth year, said columns being numbered the same as the disk, and a table of the days of the Week and I month arranged in columns and having a disk JOEL LEE LANDRUM.

Witnesses:

J. E. EVANS, JOHN A. Norr.

j a table of years of a century arranged in a scribing Witnesses. 

